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Features
Switching
Regulator
• Efficiency up to 94%, no need for heatsinks
• Pin compatible with LM78XX linears
• Low profile (L/W/H=11.5 x 7.55 x 10.2mm)
• Wide input range
• Short circuit protection, thermal shutdown
• Low ripple and noise
• IEC/EN60950-1 certified
R-78-1.0
Description
The R-78xx-1.0 series switching regulators are ideally suited to replace 1 Amp 78xx linear regulators
and are pin compatible. Efficiencies of up to 94% mean that very little energy is wasted as heat so there
is no need for any heat sinks with their additional space and mounting costs.
DC/DC Converter
1.0 Amp
SIP3
Single Output
IEC/EN60950-1 certified
EN55032 compliant
Selection Guide
Part Input Output Output Efficiency
Number Voltage Range Voltage Current @ min Vin @ max. Vin
[VDC] [VDC] [A] [%] [%]
R-781.8-1.0 4.75 - 18 1.8 1.0 82 76
R-782.5-1.0 4.75 - 18 2.5 1.0 87 81
R-783.3-1.0 4.75 - 18 3.3 1.0 90 84
R-785.0-1.0 6.5 - 18 5.0 1.0 94 89
Specifications (measured @ Ta= 25°C, 10% minimum load, unless otherwise stated)
BASIC CHARACTERISTICS
Parameter Condition Min. Typ. Max.
Quiescent Current Vin = min. to max. at 0% load 5mA 7mA
Internal Power Dissipation 0.4W
Minimum Load (1) 0%
Internal Operating Frequency 280kHz 350kHz 430kHz
Output Ripple and Noise measured at 20MHz BW 20mVp-p 30mVp-p
Absolute Maximum
Capacitive Load
1 second start up, no external components 220µF
<1 second start up + diode protection circuit 6800µF
continued on next page
Notes:
Note1: Operation under no load will not harm the converter, but specifications may not be met
A minimum load of 10mA is recommended
Model Numbering
Output Voltage Output Current
R-78__-1.0
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DC/DC Converter
R-78xx-1.0
Series
Specifications (measured @ Ta= 25°C, 10% minimum load, unless otherwise stated)
Efficiency vs. Vin (full load)
Efficiency vs. Load (max. Vin)
Efficiency vs. Load (min. Vin)
Ripple vs. Vin (full load)
Ripple vs. Load (max. Vin)
Ripple vs. Load (min. Vin)
5 7 9 11 13 15 17 18
100
80
60
40
90
70
50
30
20
10
0
Efficiency [%]
Input Voltage [VDC]
5Vout
3.3Vout
2.5Vout
1.8Vout
0 10 20 30 40 50 60 70 80 90 100
100
80
60
40
90
70
50
30
20
10
0
Efficiency [%]
Output Load [%]
5Vout
3.3Vout
2.5Vout
1.8Vout
0 10 20 30 40 50 60 70 80 90 100
100
80
60
40
90
70
50
30
20
10
0
Efficiency [%]
Output Load [%]
5Vout
3.3Vout
2.5Vout
1.8Vout
5 7 9 11 13 15 17 18
50
40
30
20
45
35
25
15
10
5
0
Ripple [mV]
Input Voltage [VDC]
5Vout
3.3Vout
2.5Vout
1.8Vout
0 10 20 30 40 50 60 70 80 90
100
50
40
30
20
45
35
25
15
10
5
0
Ripple [mV]
Output Load [%]
5Vout
3.3Vout
2.5Vout
1.8Vout
0 10 20 30 40 50 60 70 80 90
100
50
40
30
20
45
35
25
15
10
5
0
Ripple [mV]
Output Load [%]
5Vout
3.3Vout
2.5Vout
1.8Vout
www.recom-power.com REV.: 4/2019 I-3
DC/DC Converter
Specifications (measured @ Ta= 25°C, 10% minimum load, unless otherwise stated)
R-78xx-1.0
Series
PROTECTIONS
Parameter Condition Value
Short Circuit Protection (SCP) continuous, automatic recovery
Short Circuit Input Current nom. Vin= 12VDC 100mA max.
Optional Diode Protection Circuit
REGULATIONS
Parameter Condition Value
Output Accuracy 100% load ±2.0% typ / ±3.0% max.
Line Regulation low line to high line, 100% load ±0.2% typ. / ±0.4% max.
Load Regulation 10% to 100% load ±0.4% typ. / ±0.6% max.
Transient Response 100% <-> 50% load ±85mV typ. / ±100mV max.
ENVIRONMENTAL
Parameter Condition
Value
Operating Temperature Range with derating (see graph) -40°C to +85°C
Maximum Case Temperature +100°C
Temperature Coefficient ±0.015%/K
Thermal Impedance 0.1m/s, vertical 70K/W
Operating Altitude 2000m
Operating Humidity non-condesing 95% RH max.
Pollution Degree PD2
MTBF according to MIL-HDBK-217F, G.B. +25°C
+71°C
13338 x 103 hours
3880 x 103 hours
Add a blocking diode to Vout if
current can flow backwards into
the output, as this can damage the
converter when it is powered down.
The diode can either be fitted
across the device if the source is
low impedance or fitted in series
with the output (recommended).
Optional Protection 1: Optional Protection 2:
-40 60 80
85
10040200
0
20
30
40
60
80
100
Ambient Temperature [°C]
Output Power [%]
Derating Graph
+Vin +Vout
GNDGND
+Vin +Vout=
+Vout - 0.3V
R-78xx-1.0
GND
+V
out
+V
in
GNDGND
R-78xx-1.0
GND
+V
out
+V
in
+Vin +Vout
GNDGND
+Vin +Vout=
+Vout - 0.3V
R-78xx-1.0
GND
+V
out
+V
in
GNDGND
R-78xx-1.0
GND
+V
out
+V
in
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DC/DC Converter
Specifications (measured @ Ta= 25°C, 10% minimum load, unless otherwise stated)
R-78xx-1.0
Series
SAFETY AND CERTIFICATIONS
Certificate Type (Safety) Report / File Number Standard
Information Technology Equipment, General Requirements for Safety
1603123 IEC60950-1:2005, 2nd Edition + AM 2:2013
EN60950-1:2006 + AM 2:2013
EAC RU-AT.49.09571 TP TC 004/2011
RoHs 2+ RoHS 2011/65/EU + AM2015/863
EMC Compliance Condition Standard / Criterion
Electromagnetic compatibility of multimedia equipment -
Emission requirements
with external filter
(see filter suggestion below) EN55032, Class A and B
ESD Electrostatic discharge immunity test Contact ±6kV EN61000-4-2, Criteria A
Radiated, radio-frequency, electromagnetic field immunity test 3V/m EN61000-4-3, Criteria A
Fast Transient and Burst Immunity ±1.0kV EN61000-4-4, Criteria A
Immunity to conducted disturbances, induced by radio-frequency fields
3V EN61000-4-6, Criteria A
Power Magnetic Field Immunity 50Hz, 3A/m EN61000-4-8, Criteria A
DIMENSION AND PHYSICAL CHARACTERISTICS
Parameter Type Value
Material
case
potting
PCB
non-conductive black plastic, (UL94 V-0)
silicone, (UL94 V-0)
FR4, (UL94 V-0)
Package Dimension (LxWxH) 11.5 x 7.55 x 10.2mm
Package Weight 1.9g typ.
continued on next page
EMC Filter Suggestion according to EN55032
R-78xx-1.0
C
1
C
2
GND
+Vout
+Vin
GND
+V
out
GND
+V
in
L
1
Component List Class A Component List Class B
MODEL C1 L1
R-783.3-1.0 10µF
100V MLCC
3.9µH choke
RLS-397
R-785.0-1.0
MODEL C1 C2 L1
R-783.3-1.0 10µF
100V MLCC
2.2µF
100V MLCC
5.6µH choke
RLS-567
R-785.0-1.0
Notes:
Note2: Filter suggestions are valid for indicated part numbers only. For other part numbers, please contact RECOM tech support for advice
www.recom-power.com REV.: 4/2019 I-5
DC/DC Converter
Specifications (measured @ Ta= 25°C, 10% minimum load, unless otherwise stated)
R-78xx-1.0
Series
Bottom View
123 123
2.54
2.54
2.00
11.5 7.55
0.70+0.10/-0.05
3.21
5.08
10.24.10
0.51
0.25±0.05
Marking
embossed logo
Top View
Dimension Drawing (mm)
Recommended Footprint Details
Pin Connections
Pin # Single
1 +Vin
2 GND
3 +Vout
Tolerance: xx.x= ±0.5mm
xx.xx= ±0.25mm
INSTALLATION AND APPLICATION
High Efficiency, Isolated, Dual Unregulated Output
Isolated (up to 6kVDC), Wide Input Range Regulated Output
C1 C2
C1, C2: optional
C1
DC/DC Converter (1:1)
- High isolation voltage
- Improved load / line Regulation
- Wide input voltage
- Point-of-load architecture
C1
+Vout
-Vout
Com
+Vout
GND
+Vin
GND
+Vin
GND
R-78xx-1.0
GND
+V
out
+V
in
R-78xx-1.0
GND
+V
out
+V
in
- Medical grade isolated dual outputs
- Wide input range 6.5V to 18V
- High efficiency, suitable for 12V battery powered devices
C1: optional
C2: required (further decoupling filtering may
be necessary between the two converters)
DC/DC Converter (1:1)
C1 C2
C1, C2: optional
C1
DC/DC Converter (1:1)
- High isolation voltage
- Improved load / line Regulation
- Wide input voltage
- Point-of-load architecture
C1
+Vout
-Vout
Com
+Vout
GND
+Vin
GND
+Vin
GND
R-78xx-1.0
GND
+V
out
+V
in
R-78xx-1.0
GND
+V
out
+V
in
- Medical grade isolated dual outputs
- Wide input range 6.5V to 18V
- High efficiency, suitable for 12V battery powered devices
C1: optional
C2: required (further decoupling filtering may
be necessary between the two converters)
DC/DC Converter (1:1)
www.recom-power.com REV.: 4/2019 I-6
DC/DC Converter
Specifications (measured @ Ta= 25°C, 10% minimum load, unless otherwise stated)
R-78xx-1.0
Series
The product information and specifications may be subject to changes even without prior written notice.The product has been designed for various applications; its suitability lies in the responsibility of each customer.
The
products are not authorized for use in safety-critical applications without RECOM’s explicit written consent. A safety-critical application is an application where a failure may reasonably be expected to endanger or
cause
loss of life, inflict bodily harm or damage property. The applicant shall indemnify and hold harmless RECOM, its affiliated companies and its representatives against any damage claims in connection with the
unauthorized
use of RECOM products in such safety-critical applications.
PACKAGING INFORMATION
Parameter Type Value
Packaging Dimension (LxWxH) tube 520.0 x 9.3 x 16.5mm
Packaging Quantity tube 42pcs
Storage Temperature Range -55°C to +125°C
Storage Humidity 95% RH max.
